The Pixel Charging-up effect in Gas Micro-Pixel Detectors
arxiv(2024)
摘要
This study investigates the charging-up effect on the Topmetal-II^- chip in
Gas Micro-Pixel Detectors(GMPD). It is found that this effect differs from the
charging-up typically observed in gas detector multiplier devices and increases
the effective gain of the detector. The research indicates that this effect
originates from the accumulation of charges on the insulating layer of the
chip's pixel surface and is unlikely to dissipate naturally. Iterative
simulations using COMSOL and GARFIELD++ were employed to model the variation of
detector effective gain with the charging-up effect, and a simple yet effective
model was proposed, which aligns well with experimental data. The study
suggests that to ensure stable detector gain and reduce residual modulation in
polarization detection, charging-up to near saturation state is required before
operating the GMPD.
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